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Subject[PATCH] perf/x86/intel/uncore: Avoid null dereferences (uncore_extra_pci_dev)
Date
If an uncore has no pci_init routine, or that routine fails,
uncore_pci_init is not called, and memory is not allocated for
uncore_extra_pci_dev.

So check to make sure uncore_extra_pci_dev is not NULL before use.

And fix the case that led us to discover the null derefs; don't fail
snbep_pci2phy_map_init if BIOS doesn't supply pcibus_to_node
information.

Fixes: 9a7832ce3d92 ("perf/x86/intel/uncore: With > 8 nodes, get pci bus die id from NUMA info")

Signed-off-by: Steve Wahl <steve.wahl@hpe.com>
---
arch/x86/events/intel/uncore_snbep.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c
index b79951d0707c..14c24356a2fa 100644
--- a/arch/x86/events/intel/uncore_snbep.c
+++ b/arch/x86/events/intel/uncore_snbep.c
@@ -1373,11 +1373,11 @@ static int snbep_pci2phy_map_init(int devid, int nodeid_loc, int idmap_loc, bool
/*
* The nodeid and idmap registers only contain enough
* information to handle 8 nodes. On systems with more
- * than 8 nodes, we need to rely on NUMA information,
+ * than 8 nodes, if available we rely on NUMA information,
* filled in from BIOS supplied information, to determine
* the topology.
*/
- if (nr_node_ids <= 8) {
+ if ((nr_node_ids <= 8) || (pcibus_to_node(ubox_dev->bus) == -1)) {
/* get the Node ID of the local register */
err = pci_read_config_dword(ubox_dev, nodeid_loc, &config);
if (err)
@@ -2865,7 +2865,9 @@ void hswep_uncore_cpu_init(void)
hswep_uncore_cbox.num_boxes = boot_cpu_data.x86_max_cores;

/* Detect 6-8 core systems with only two SBOXes */
- if (uncore_extra_pci_dev[pkg].dev[HSWEP_PCI_PCU_3]) {
+ if (!uncore_extra_pci_dev)
+ hswep_uncore_sbox.num_boxes = 2;
+ else if (uncore_extra_pci_dev[pkg].dev[HSWEP_PCI_PCU_3]) {
u32 capid4;

pci_read_config_dword(uncore_extra_pci_dev[pkg].dev[HSWEP_PCI_PCU_3],
@@ -3243,6 +3245,8 @@ void bdx_uncore_cpu_init(void)
if (boot_cpu_data.x86_model == 86) {
uncore_msr_uncores[BDX_MSR_UNCORE_SBOX] = NULL;
/* Detect systems with no SBOXes */
+ } else if (!uncore_extra_pci_dev) {
+ bdx_msr_uncores[BDX_MSR_UNCORE_SBOX] = NULL;
} else if (uncore_extra_pci_dev[pkg].dev[HSWEP_PCI_PCU_3]) {
struct pci_dev *pdev;
u32 capid4;
--
2.26.2
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